If you think it's a black and white "HURR TITS" vs "Quite interesting, madam. Please tell me where I might subscribe to your newsletter." rather than a spectrum therebetween, you're sorely mistaken.

Marketers have (I can only assume) found that triggering the former to lead to the latter is a working strategy (they do tend to at least try to base their actions on observed results). Even if that's not the case the concept that there's a dual throw switch for power between the gonads and the brain seems pretty silly and needlessly underestimates men (though it sort of overestimates them at the same time I guess...).